写了个小程序，关于shell字符串截取的，保存以防忘记：

!/bin/bash  
  
#|--------------------------------------|  
#|Author: Liwenta                       |  
#|Email:  email.tata@qq.com             |  
#|Date:   2013-01-05                    |  
#|--------------------------------------|  
  
str="/project/mkdemo/src"  
echo '${str}='${str}  
echo '${#str}='${#str}  
  
tmp=`dirname ${str}`  
echo 'dirname ${str}='${tmp}  
  
tmp=`basename ${str}`  
echo 'basename ${str}='${tmp}  
  
tmp=${str#*/}  
echo '${str#*/}='${tmp}  
  
tmp=${str##*/}  
echo '${str##*/}='${tmp}  
  
tmp=${str%/*}  
echo '${str%/*}='${tmp}  

运行结果：

[root@tata.domain /andes/shell/string]#./ph.sh    
${str}=/project/mkdemo/src  
${#str}=19  
dirname ${str}=/project/mkdemo  
basename ${str}=src  
${str#*/}=project/mkdemo/src  
${str##*/}=src  
${str%/*}=/project/mkdemo  
${str%%/*}=